Which speaker system for my new gym?

[HappyHippyDad]

I've just has a gym built in the garden and want to kit it out with a decent sound system. I know very little about newer technology hence asking here.

I would want to be able to use spotify from my android phone and also utilise the speakers for the TV that will be going in there.

The plan would be 4 speakers around the corners I guess.

Any recommendations?

I think it would be better to have them wired to the TV , hence taking power from the TV, otherwise I'm guessing I would need to add sockets to every corner of the room. Again, really not sure how these bluetooth/wireless etc etc things get powered.

Cheers